Mixer structure for a film die and a film die

Abstract

A mixer structure for a film die for a polymer melt includes multiple web elements. The web elements include a first web element and a second web element. The first web element and the second web element include at least an end, which is connected to a base. A film die includes a first tool element, a second tool element, and a flow channel for the polymer melt extending between the first tool element and the second tool element. The mixer structure is arranged in the flow channel. The mixer structure is held in at least one of the tool elements by a holding element.

What is claimed is: 
     
       1. A film die comprising a first tool element, a second tool element, a flow channel for a polymer melt flowing from an inlet opening to an outlet opening of the flow channel thereby defining a direction of fluid flow, wherein the flow channel extends between the first tool element and the second tool element, whereby a mixer structure is arranged in the flow channel, whereby the mixer structure comprises a base, a first web element and a second web element, whereby the mixer structure is held in at least one of the tool elements by at least one holding element, whereby a length of a projection of the mixer structure in the direction of fluid flow is greater or substantially equal to a width of the holding element measured in the direction of fluid flow, whereby at least one of the first web element or the second web element comprises at least an end which is connected to the base configured to be received in an inner wall of the film die, and whereby at least one of the first web element or the second web element is received at least partially in the base. 
     
     
       2. The film die of  claim 1 , whereby the base is attached to at least one of the first tool element or the second tool element. 
     
     
       3. The film die of  claim 1 , whereby the base is received in the holding element or is configured as the holding element. 
     
     
       4. The film die of  claim 1 , whereby the first web element is arranged crosswise to the second web element. 
     
     
       5. The film die of  claim 1 , whereby the mixer structure comprises a ribbon or a ribbon segment, whereby the ribbon can have a width which corresponds to less than ten times of a flow channel thickness. 
     
     
       6. The film die of  claim 1 , whereby the first tool element and the second tool element comprise the inlet opening and the outlet opening whereby the flow channel has a flow channel length which extends from the inlet opening to the outlet opening as a shortest connection line, whereby the flow channel has a flow channel thickness which is configured as a normal distance of the first tool element to the second tool element, as well as a flow channel width which extends in a normal direction with respect to the flow channel thickness and the flow channel length. 
     
     
       7. The film die of  claim 6 , whereby the flow channel width at the outlet opening is greater than the flow channel width at the inlet opening. 
     
     
       8. The film die of  claim 6 , whereby the mixer structure extends over the flow channel width. 
     
     
       9. The film die of  claim 1 , whereby the base comprises a screw connection for connection with one of the first tool element or the second tool element.